Plumbing fitting



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4 Filed Aug. 1 9, 1935 if?! E v i :I i Vl w UNITED STATES PATENT ori-TCE `PLUMBING FITTING `Philip Lane Scott, Chicago, Ill., assignor to Super Diesel Tractor Corporation, La Porte, Ind., a corporation of New York Application August 19, 1935, Serial N0. 36,881 I o Claims. (Cl. 285-197) This invention relates to means for joining tuband uniform bore with respect to the bore of the ing and more particularly to means for joining tubing. In practice this joint is made as follows. thin walled tubing where the use of threads is A taper drift of the same taper as that of the undesirable or impracticable. f sleeve is driven into theends of the tubes to be 5 One object of the invention is to provide a simjoined. Thin walled tubing of brass or copper 5 ple joint which will not require a soldering or will expand suiilciently without diiiiculty as will brazing operation or a threading operation. soft steel, butin some cases it may be necessary Another object is to provide a joining device to anneal a hard material used for such tubing. which will avoid separate threaded members. After the tube ends have been expanded vto a Another object is to provide a device which may little more than the major diameter of the sleeve l0 be readily used in the held, to make a satisfactory the sleeve is inserted in one tube end and the joint. other tube end brought up upon the sleeve snugly.

The invention is illustrated more or less dia- The ends of the tubes, which will obviously overgrammatically in the accompanying drawing, lap the edges of the grooves slightly since the diwherein: ameter is slightly greater than the sleeve diam- 15 Figure 1 is a cross section of a joint between eter, are then rolled in to the groove by means two tube ends formed according to this invention. of the tool shown in Figure 2. The lower half of Figure 2 is an elevation of the tool used to form the tool 8 supports the tubes in the semi-circular such a joint. groove I3 which is slightly larger than the diaml 2o Figure 3 is a section taken at` line 3--3 of Figeter to be rolled. The wheel I5 which projects 2@ ure 2, on an enlarged scale. slightly into the mating groove I4 in the upper Like .parts are designated by like characters half oi the tool extends below the diameter to be throughout. rolled and will therefore force the lips of the tubes l designates an end of a portion of thin walled into the groove.

tubing. 2 is another end portion of thin walled In forcing the lip of the tube into the groove it 25 tubing. 3 is a tubular double tapered connecting will be seen that there is a tendency to further piece, which has a circumferential groove at Il, drew 11D the tubes snugly upon the tepel'- and ieather edges at 5, 5. The ends ofthe tubes In tubing Which Carries a ud under moderate I and 2 are rolled into this groove as shown at pressures. e Seel iS produced at the feather edges so 6, t. 'rnc connecting piece t has a bore l. 5, t, which, being very thin, will expand outward- 3c In Figure 2, 8 and 9 are two jaws of a tool ly against the tubes I, 2,due to the internal presj somewhat similar to an ordinary linemans pliers Sure- Sealing also oeelll'S along the tapered S111'- or tongs,`jointed at IIl and having handle extenfaces and et the edges of the groove 4 where the sions II and I2. The member 8 has a semi-circutube lips are rolled .over as at 6, 6, regardless oi lar groove I3 and the member t a semi-circular. pressure. 35 groove i into which the edge of a roller wheel It is of course obvious that this type of joint I5 projects. The roller wheel I5 is mounted in a need not be used to join two tubes but may 30m e slot I6 cut in 9, and on the pin Ii. l tube to some other member provided the other Heretofore the problem of joining thin walled member has a projection which corresponds in 40 tubing has been solved by the use of separate form to the tapered sleeve. m)

threaded connecting members with or without ex- It is to be understood that a wide variety of ternal thirnbles, or by brazing, soldering, or by modifications may be made in proportions and di- Welding, since the cutting oi threads is either mensions without departing from the spirit of the diilicult or impractical in such tubing. Such coninvention.

nections have either proved relatively costly or I claim: 46

have been diicult to handle in the iield, or have l. A connector for metallic tubing comprisin proven unsatisfactory where vibration existed. a double exteriorly tapered sleeve having approxi- The purpose of this invention is to overcome these mately the same interior diameter as that of the various objections. This is accomplished by prosaid tubing and provided with a groove positioned 5o viding a tubular connecting piece or sleeve tasubstantially at its middle and formed in its ex- 50 pered from the center toward a feather edge at terior, and having a feather edge at one end said vboth ends, and having a circumferential groove edge expanding under internal pressure effect a cut' in the center. This tube or sleeve requires seal. merely two operations with simple tools to form A 2. A connector for thin walled metallic' tubing a permanent joint of small increased diameter, comprising a double exteriorly tapered metallic sleeve having approximately the same interior diameter as that of the said tubing and provided adjacent its eenter with a circumferential groove formed in its exterior and having a feather edge at each end said edge expanding under internal pressure to enect a seal.

3. In a tubing Joint, an expanded tube end, an exteriorly tapered member provided with an exterior depression. said tapered member adapted to mate with the expanded tube end and havin! a feather edge at one end and a depressed end portion of the tube extending into and seizing the said depression, in said tapered member.

4. In a tubing joint, ad expanded metallic tube 15 end, an exterioriy tapered member provided with an exterior groove at its largest diameter, said tapered member adapted to mate with the expanded tube end, and having a feather edge at one end, and a depressed end portion of the tube extending into and seizing the groove, said feathered end expanding under. internal pressure to eiIect a seal.

5. In a thin walled tubing joint, an expanded tube end, a tapered member provided with an exterior groove at its largest diameter, said tapered member adapted to mate with the expanded tube end, and having a feather edge at each end, and a depressed portion of thel tube extending into and seizing the said groove.

PHILIP LANE BCOIT. 

